Removing a gap in vertical lines in a table

Question

How I can resolve this table problem. It cut a part of vertical line.

\documentclass{article}
\usepackage{amsmath}
\usepackage{array}
\usepackage[italian]{babel}
\usepackage{float}
\begin{document}
\begin{table}[H]
    \centering
    \begin{tabular}{>{\centering}m{0.22\textwidth}|>{\centering}m{0.20\textwidth}|>{\centering}m{0.20\textwidth}|>{\centering}m{0.20\textwidth}}
             & $x=10$ & $x=100$ & $x=1000$\tabularnewline[0.2em]
            \hline \
            $y=\log_{10}x$ & $1$ & $2$ & $3$\tabularnewline[0.5em]
            $y=x^2$ & $10^2$ & $10^4$ & $10^6$\tabularnewline[0.5em]
            $y=10^x$ & $10^{10}$ & $10^{100}$ & $10^{1000}$
    \end{tabular}
\end{table}
\end{document}

don't use \\ after \hline – David Carlisle Oct 11 '21 at 16:40 — David Carlisle, Oct 11 '21 at 16:40

score 2 · Answer 1 · answered Oct 11 '21 at 19:12

You should remove \\ after \hline as suggested by David Carlisle in the comment. If you want to add some vertical space after the 1st horizontal line, you can follow this answer by Mico. Combining these two, the code is as follows:

\documentclass{article}
\usepackage{amsmath}
\usepackage{array}
\newcommand\Tstrut{\rule{0pt}{2.6ex}}         % = `top' strut
\usepackage[italian]{babel}
\usepackage{float}
\begin{document}
\begin{table}[H]
    \centering
    \begin{tabular}{>{\centering}m{0.22\textwidth}|>{\centering}m{0.20\textwidth}|>{\centering}m{0.20\textwidth}|>{\centering}m{0.20\textwidth}}
             & $x=10$ & $x=100$ & $x=1000$\tabularnewline[0.2em]
            \hline 
            $y=\log_{10}x$\Tstrut & $1$\Tstrut & $2$\Tstrut & $3$\Tstrut\tabularnewline[0.5em]
            $y=x^2$ & $10^2$ & $10^4$ & $10^6$\tabularnewline[0.5em]
            $y=10^x$ & $10^{10}$ & $10^{100}$ & $10^{1000}$
    \end{tabular}
\end{table}
\end{document}

score 2 · Answer 2 · answered Oct 11 '21 at 20:19

Your problem is \hline\\ which could be

\hline &&& \\[-1.5ex]

(experiment the value). In general it's best to use ex units for vertical spacing.

I propose three realizations of the table, in decreasing order of ugliness.

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[italian]{babel}
\usepackage{amsmath}
\usepackage{array}
\usepackage{booktabs}
\begin{document}
\begin{center}
\begin{tabular}{
  w{c}{0.22\textwidth}|
  w{c}{0.20\textwidth}|
  w{c}{0.20\textwidth}|
  w{c}{0.20\textwidth}
}
& $x=10$ & $x=100$ & $x=1000$ \
\hline
&&&\[-1.5ex]
$y=\log_{10}x$ & $1$ & $2$ & $3$ \[1ex]
$y=x^2$ & $10^2$ & $10^4$ & $10^6$ \[1ex]
$y=10^x$ & $10^{10}$ & $10^{100}$ & $10^{1000}$
\end{tabular}
\end{center}
\begin{center}
\begin{tabular}{\textwidth}{@{\extracolsep{\fill}}cccc@{}}
\toprule
& $x=10$ & $x=100$ & $x=1000$ \
\midrule
$y=\log_{10}x$ & $1$ & $2$ & $3$ \
\addlinespace
$y=x^2$ & $10^2$ & $10^4$ & $10^6$ \
\addlinespace
$y=10^x$ & $10^{10}$ & $10^{100}$ & $10^{1000}$ \
\bottomrule
\end{tabular}
\end{center}
\begin{center}
\setlength{\tabcolsep}{1em}
\begin{tabular}{@{}lccc@{}}
\toprule
Funzione & \multicolumn{3}{c@{}}{Valore di $x$} \
\cmidrule{2-4}
& $10$ & $100$ & $1000$ \
\midrule
$y=\log_{10}x$ & $1$ & $2$ & $3$ \
\addlinespace
$y=x^2$ & $10^2$ & $10^4$ & $10^6$ \
\addlinespace
$y=10^x$ & $10^{10}$ & $10^{100}$ & $10^{1000}$ \
\bottomrule
\end{tabular}
\end{center}
\end{document}

Avoid [H]; if there is no caption, a center environment suffices. If there's a caption, let the environment float.

I left “y=”, but I consider it bad mathematical usage.

score 0 · Answer 3 · answered Oct 11 '21 at 19:39

\documentclass{article}
\usepackage{amsmath}
\usepackage{array}
\usepackage[italian]{babel}
\usepackage{float}
\begin{document}
\begin{table}[H]
\centering
\begin{tabular}{>{\centering}m{0.22\textwidth}|>{\centering}m{0.20\textwidth}|>{\centering}m{0.20\textwidth}|>{\centering}m{0.20\textwidth}}
     & $x=10$ & $x=100$ & $x=1000$\tabularnewline[0.2em]\hline 
     & & &\tabularnewline[0.2em]
    $y=\log_{10}x$ & $1$ & $2$ & $3$\tabularnewline[0.5em]
    $y=x^2$ & $10^2$ & $10^4$ & $10^6$\tabularnewline[0.5em]
    $y=10^x$ & $10^{10}$ & $10^{100}$ & $10^{1000}$
\end{tabular}
\end{table}
\end{document}

score 0 · Answer 4 · answered Oct 12 '21 at 05:07

You can't put \\ after \hline. If you want to add space after \hline, you can add \noalign{\vskip1mm}. This will break the vertical rule. However, if you use {NiceTabular} instead of {tabular}, the rules won't be broken (with nicematrix, the rules are drawn with PGF/Tikz after the construction of the array).

\documentclass{article}
\usepackage{amsmath}
\usepackage{array}
\usepackage[italian]{babel}
\usepackage{float}
\usepackage{nicematrix}
\begin{document}
\begin{table}[H]
\centering
\begin{NiceTabular}{>{\centering}m{0.22\textwidth}|>{\centering}m{0.20\textwidth}|>{\centering}m{0.20\textwidth}|>{\centering}m{0.20\textwidth}}
     & $x=10$ & $x=100$ & $x=1000$\tabularnewline[0.2em]
    \hline 
    \noalign{\vskip1mm}
    $y=\log_{10}x$ & $1$ & $2$ & $3$\tabularnewline[0.5em]
    $y=x^2$ & $10^2$ & $10^4$ & $10^6$\tabularnewline[0.5em]
    $y=10^x$ & $10^{10}$ & $10^{100}$ & $10^{1000}$
\end{NiceTabular}
\end{table}
\end{document}

You need several compilations (because nicematrix uses PGF/Tikz nodes under the hood).

Removing a gap in vertical lines in a table

4 Answers4